PHP Event Calendar is a modern, Ajax based, multi-user calendar/scheduling application. It supports multiple calendars, shared calendars, event drag and drop, Google Calendar import, email reminders, repeating events, multiple calendar views, and many other features. It can be customized easily to integrate into your own environment or it can be used right out of the box as a standalone event calendar/scheduling application. It supports all major Web browsers as well as mobile devices.

Canvas Drawing Wordpress Plugin is a Wordpress plugin that lets users draw using basic options like pen and brush. It adds a gallery showing the drawings made by different users, with an elegant slider that shows the best drawings as selected by the admin.

Yellow is a flat-file content management system. Everything is made of files and folders. You can create Web pages, blogs, and wikis. Its features include a Web interface, static content generation, Markdown, and Dropbox support.

WSN Webcomic is a collaborative webcomic creator.
Anyone can use it to create a new comic
or draw another panel to continue the story of one of the
existing comics.
Optionally it lets people edit comics, as well.
It uses a simple HTML 5/jQuery drawing interface.